508 CONSERVATIVE ORGANS. [JLECT. IX. 



nervation is in some instances not regular ; but one 

 large fasciculus is given cff on each side of the 

 midrib, at the very base of the expansion, dividing 

 and subdividing as it proceeds, as in the annual 

 Sunflower, Helianthus annuus; in which case the 

 leaf is said to be basi-trinerve, 63. The same leaf 

 is also an example of the term venoso-nervosum, 

 which is used by some authors to imply that the 

 nerves pass into veins. If the lateral longitudinal 

 fasciculi do not spring directly from the base, but 

 so far above it, that part of the expansion of the 

 leaf is below them, as in the leaf of the Cinnamon 

 tree, Laurus Cinnamomum, 64, the terms em- 

 ployed are triplinerve, quintuplinerve, multipli- 

 nerve. In one example of the multiplinerved leaf, 

 Hydrogetoufenestralis*, 65, the longitudinal fas- 

 ciculi are united by transverse bands, forming 

 square meshes, which are perfectly void, like 

 wire-work, giving that character which Botanists 

 have termed fenestrated, or open ( fenestratum) . 

 But when the longitudinal fasciculi, forming ex- 

 current nerves, are united by transverse fasciculi, 

 however elevated or strongly marked these may 

 be, if the intermediate spaces be filled with the 

 expansion, as in 66, the leaf receives no particular 

 appellation. 



Ribbed (costatum), is sometimes employed as 



* This singular plant is an aquatic, a native of Madagascar. 



